Saw-sharpening machine



(No Model.)

2 Sheets-Sheet '1.

M. OOVEL.

SAW SHARPENING 'MAGHINB.

Patented Feb. 19, 1889.

(No Model.) 2 Shets-Sheet 2.

M. OOVEL.

SAW SHARPENING MACHINE.

Patented Feb. 19

N. PETERS, Pholn'Lllhogrlphar, washinglun. 0.0.

ilNTTnn STATES PATENT @FFTQF.

MILO COVEL, OF CHICAGO, ILLINOIS.

SAW-SHARPENING MACHINE.

SPECIFICATION forming part of Letters Patent No. 398,030, dated February 19, 1889.

Application filed October 18, 1888. Serial No. 288,454. (No model.)

I 0 all whom it may concern;

Be it known that I, MILO COvEig, of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Saw-Sharpening Machines, of which the following is a full, clear, and exact description, that will enable others to make and use the same, reference being had to the accompai'iying drawings, tormin g a part of this specification.

This invention relates to improvements in that class of machines for which a number of patents have been granted me heretofore, the present improvement being more especially intended for dressing-band and straight saws, the same consistiu of certain novel features in the construction, arrangement, and

' operation oi the several parts, as will be hereinafter set forth.

Figure 1 is a front elevation of a machine embodying my improved features; Fig. 2, a horizontal section in plane 2, Fig. 1; Fig. 3, a rear elevation of the head-piece carrying the emery-wheel and gate; Fig. it, a vertical section in plane 4, Fig. 1; Fig. 5, a horizontal section in plane 5, Fig. 1; and Fig. 6, a vertical section in plane 6, Fig. 1.

Referring to the drawings, A represents the different parts of the supporting-frame; B, the head-piece, and B the emery or sharpening wheel, provided with suitable journal -bearings in the gate Biwhich has the usual up-anddown movement. This reciprocating movement is imparted to the emery-wheel gate through the medium of the adjustable connecting-rod B, the horizontal slotted arm B, the comiecting-rod B, and the horizontal lever B, the outer end of which is pivoted to the frame at a. The roller a (see Fig. 1, dotted lines) is journaled in the under side of the lever B near the inner end, and has a rolling contact with the cam o rigidly mounted on the driving-shaft 0 just back of the cam C, mounted on the front end of said shaft. Thehandle a connected to the slotted arm B", provides a means for raising and lowering the emery-wheel by hand when it is necessary so to do. I

The head-piece B is pivoted to the bracket (0 by the bolt a (see Fig. 3) on the side adjacent to the emery-wheel, the opposite side O, and serves the purpose of imparting the required motion to the curved or radius feedarm C This feed-arm is rigidly mounted near its longitudinal center on the rock-shaft C, (see Figs. 1 and 6,) and has an oscillating or rocking movement therewith. A roller, b, is journaled in the lower end of the feed-arm and has a rolling contact with the cam C, which as it rotates rocks the feed-arm. The feed-finger O has a longitudinal adjustment in the slide 1) by means of the hand-nut b engaging with the outer threaded end of the feed-finger, as shown in Fig. 1. The elongated slot b in the upper end of the feed-arm provides a means for changing the angle of the feed-finger with relation to the saw and the shape of the teeth, as the slide b may be raised or lowered and secured at any point by clamping-bolt Z). The opposite end and inner edge of the feed-linger is provided with the downward-projecting lip b (see Figs. 1 and 2,) which has frictional contact with the inner edge of the stationary plate I), thus preventing a lateral outward movement of the feed-finger.

The adjustable stop I) is recessedin the base of the bracket a, and has a longitudinal adjustment therein by means of the belt 19 having a screw-threaded connection therewith. This feature provides a positive stop for the feed-finger on its inward movement, and prevents the same following the saw be yond a fixed point.

The spring 0 (see Fig. 6) is coiled on the rock-shaft C and serves to hold the lower end of the feed-arm normally in contact with the cam C.

The bracket D (see Figs. 1, i, and 5) is notched 011 the inner side to overlap the edges of the horizontal bar D, as shown in Fig. 4.

This bracket is also mounted on the'screwthreaded shaft D by which means the same is moved along on thebar D. of the hinge-plate d is mounted on the pivotbolt (1, The clamping-plate d is adjustably secured to the outer side of the hinge-plate by the bolts [1, the elongated slots (1" in the clainping-plate 'n'oviding for a vertical adjustment with relation to the hingeplate and the saw. The position of the saw is indicated by the vertical broken lines in Fig. 4C and by the horizontal lines in Fig. The lower end of the clamping-sprin d bolted to the corresponding end of the bracket D, the upper end bearin against the top of'the clampingplate (F. By means of the handle the spring 16' maybe thrown out of contact and the cl amping-plate and hinge-plate swung outward and downward on the pivot-bolt (Z' and out of contact with the saw, which may then be readily removed from the machine.

The cam locking-lever D (see Figs. -land 5) is secured to the top of the bracket 1) by the pivot-bolt (I The wider and curved end of this lever bears against the saw on the opposite side from that of the clamp proper and near the back edge, the saw being clamped at this point between the back plate, (Z secured to the bracket by the screw (1 and the locking-lever D. This arrangement permits of a free l'orward movement of the saw by the feed-linger, but locks the same against a back movement when the feed-linger drops back to engage the next tooth. One end of the leverspring is secured to the bracket D by the bolt g, the opposite loose end bearing against the pin 9 inserted in and projecting downward from the back end ol. the locking-lever, whereby the same is held normally against the saw.

It is oi. course understood that the clamping mechanism does not hold the saw so tightthat the feed-finger engaging with the teeth cannot easily move the same in the operation of bringing each tooth in regular order of succession to the emery-wheel.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, 13-- The lower end 1. In a saw-sharpening machine, the combination, With the supporting-frame, of the headpiece B, the bracket (0, said head-piece being pivoted to said bracket at one side and provided in the other side with a segmental slot, and an adjusting-bolt passing through said slot, whereby said head-piece may be given a greater or less degree of inelimttion, sulista-ntiallyas and for the purpose set forth.

2. In a saw-sharpening machine, the combination, with the cam (l, rigidly mounted on the driving-shaft, of aeurved feed-arm having a roller journaled in the lower end, which has frictional contact with said can], and provided in the upper end with an elongated slot, a feed-linger secured to said arm and adjustable in said slot, a rock-shalt upon which said feed-arm is rigidly mounted, and. a spring coiled on said rocksha'ft, whereby the lower end of said feed-arm is normally held in contact with the cam C and the feedfinger brought into engagement with the teeth of the sawin regular order of sucee sion, substantially as and for the purpose set forth.

3. In a saw-sharpening machine, the combination, with a feed-finger, of the bracket a, the adj ust-able stop b and the adj Listing-bolt if, having a screw-threaded engagement with said stop, substantially as and for the purpose set forth.

4. In a saw-shar 'lening machine, the combination of the lHttChOl l), the bar D, the screw-tln-eaded shal't D the hinge-plate d, pivoted at its lower end to said bracket, the clamping-plate (P, provided with elongated slots and adjustably secured to said hinge plate, and the spring (7, substantially as and for the purpose set forth.

5. In a saw-sharpening machine, the co|nbination,wit-h the bracket D,of the cam locking-leverD pivoted to said bracket, the back plate, (i and the spring 9, whereby the saw is locked against a back movement only, sub stantially as set forth.

MILO COVEL.

\Vitnesses:

J. O. Ransom, L. B. COUPLAND. 

